mirror of https://github.com/mkerrisk/man-pages
164 lines
5.0 KiB
Groff
164 lines
5.0 KiB
Groff
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.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "MKFIFO" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" mkfifo
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.SH NAME
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mkfifo \- make FIFO special files
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.SH SYNOPSIS
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.LP
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\fBmkfifo\fP \fB[\fP\fB-m\fP \fImode\fP\fB]\fP \fIfile\fP\fB...\fP
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.SH DESCRIPTION
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.LP
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The \fImkfifo\fP utility shall create the FIFO special files specified
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by the operands, in the order specified.
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.LP
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For each \fIfile\fP operand, the \fImkfifo\fP utility shall perform
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actions equivalent to the \fImkfifo\fP() function defined in the System
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Interfaces volume of IEEE\ Std\ 1003.1-2001,
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called with the following arguments:
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.IP " 1." 4
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The \fIfile\fP operand is used as the \fIpath\fP argument.
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.LP
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.IP " 2." 4
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The value of the bitwise-inclusive OR of S_IRUSR, S_IWUSR, S_IRGRP,
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S_IWGRP, S_IROTH, and S_IWOTH is used as the \fImode\fP
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argument. (If the \fB-m\fP option is specified, the value of the \fImkfifo\fP()
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\fImode\fP argument is unspecified, but the FIFO shall at no time
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have permissions less restrictive than the \fB-m\fP \fImode\fP
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option-argument.)
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.LP
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.SH OPTIONS
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.LP
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The \fImkfifo\fP utility shall conform to the Base Definitions volume
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of IEEE\ Std\ 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
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.LP
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The following option shall be supported:
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.TP 7
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\fB-m\ \fP \fImode\fP
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Set the file permission bits of the newly-created FIFO to the specified
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\fImode\fP value. The \fImode\fP option-argument
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shall be the same as the \fImode\fP operand defined for the \fIchmod\fP
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utility. In the
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\fIsymbolic_mode\fP strings, the \fIop\fP characters \fB'+'\fP and
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\fB'-'\fP shall be interpreted relative to an assumed
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initial mode of \fIa\fP= \fIrw\fP.
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.sp
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.SH OPERANDS
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.LP
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The following operand shall be supported:
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.TP 7
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\fIfile\fP
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A pathname of the FIFO special file to be created.
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.sp
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.SH STDIN
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.LP
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Not used.
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.SH INPUT FILES
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.LP
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None.
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.SH ENVIRONMENT VARIABLES
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.LP
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The following environment variables shall affect the execution of
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\fImkfifo\fP:
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.TP 7
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\fILANG\fP
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Provide a default value for the internationalization variables that
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are unset or null. (See the Base Definitions volume of
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IEEE\ Std\ 1003.1-2001, Section 8.2, Internationalization Variables
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for
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the precedence of internationalization variables used to determine
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the values of locale categories.)
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.TP 7
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\fILC_ALL\fP
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If set to a non-empty string value, override the values of all the
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other internationalization variables.
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.TP 7
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\fILC_CTYPE\fP
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Determine the locale for the interpretation of sequences of bytes
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of text data as characters (for example, single-byte as
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opposed to multi-byte characters in arguments).
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.TP 7
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\fILC_MESSAGES\fP
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Determine the locale that should be used to affect the format and
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contents of diagnostic messages written to standard
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error.
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.TP 7
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\fINLSPATH\fP
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Determine the location of message catalogs for the processing of \fILC_MESSAGES
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\&.\fP
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.sp
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.SH ASYNCHRONOUS EVENTS
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.LP
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Default.
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.SH STDOUT
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.LP
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Not used.
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.SH STDERR
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.LP
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The standard error shall be used only for diagnostic messages.
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.SH OUTPUT FILES
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.LP
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None.
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.SH EXTENDED DESCRIPTION
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.LP
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None.
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.SH EXIT STATUS
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.LP
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The following exit values shall be returned:
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.TP 7
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\ 0
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All the specified FIFO special files were created successfully.
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.TP 7
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>0
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An error occurred.
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.sp
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.SH CONSEQUENCES OF ERRORS
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.LP
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Default.
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.LP
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\fIThe following sections are informative.\fP
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.SH APPLICATION USAGE
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.LP
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None.
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.SH EXAMPLES
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.LP
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None.
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.SH RATIONALE
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.LP
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This utility was added to permit shell applications to create FIFO
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special files.
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.LP
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The \fB-m\fP option was added to control the file mode, for consistency
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with the similar functionality provided by the \fImkdir\fP utility.
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.LP
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Early proposals included a \fB-p\fP option similar to the \fImkdir\fP
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\fB-p\fP option
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that created intermediate directories leading up to the FIFO specified
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by the final component. This was removed because it is not
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commonly needed and is not common practice with similar utilities.
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.LP
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The functionality of \fImkfifo\fP is described substantially through
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a reference to the \fImkfifo\fP() function in the System Interfaces
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volume of IEEE\ Std\ 1003.1-2001. For
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example, by default, the mode of the FIFO file is affected by the
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file mode creation mask in accordance with the specified behavior
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of the \fImkfifo\fP() function. In this way, there is less duplication
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of effort required
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for describing details of the file creation.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fIchmod\fP() , \fIumask\fP() , the System Interfaces volume of
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IEEE\ Std\ 1003.1-2001, \fImkfifo\fP()
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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